Make fields required when one has a value.

[LaTeef Lusk]

I have a series of input field in a from. However I have 3 fields that need to be required if one of them has a value. If all 3 are blank I do not want them to be required. The problem I am having is if I leave the fields blank and sumbit my form its telling me I have a value in one of the fields and that the other 2 are required. My code is below. Can someone help me please. thanks!

<code>
<script language="javascript">
function validatePatientSearchForm()
{

if (document.getElementById('LAST_NAME').value != "" && document.getElementById('FIRST_NAME').value == "" || document.getElementById('BIRTH_DT').value == "")
{
alert("You entered a last name. You must also enter in a first name and date of birth.");
return false; }

if (document.getElementById('LAST_NAME').value == "" || document.getElementById('FIRST_NAME').value == "" && document.getElementById('BIRTH_DT').value != "")
{
alert("You entered a date of birth. You must also enter in a first name and last name.");
return false; }

if (document.getElementById('LAST_NAME').value == "" || document.getElementById('BIRTH_DT').value == "" && document.getElementById('FIRST_NAME').value != "")
{
alert("You entered a first name. You must also enter in a last name and date of birth.");
return false; }

}
</script>
</code>

[Bear Bibeault]

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[Kiran Joshi]

Try doing like this
Note the additional brackets surrounding the || conditions.

<script language="javascript"> 
function validatePatientSearchForm() 
{ 

if (document.getElementById('LAST_NAME').value != "" && (document.getElementById('FIRST_NAME').value == "" || document.getElementById('BIRTH_DT').value == "")) 
{ 
alert("You entered a last name. You must also enter in a first name and date of birth."); 
return false; } 

if ((document.getElementById('LAST_NAME').value == "" || document.getElementById('FIRST_NAME').value == "") && document.getElementById('BIRTH_DT').value != "") 
{ 
alert("You entered a date of birth. You must also enter in a first name and last name."); 
return false; } 

if ((document.getElementById('LAST_NAME').value == "" || document.getElementById('BIRTH_DT').value == "") && document.getElementById('FIRST_NAME').value != "") 
{ 
alert("You entered a first name. You must also enter in a last name and date of birth."); 
return false; } 

} 
</script> 

[Sagar Rohankar]

LaTeef Lusk wrote:The problem I am having is if I leave the fields blank and sumbit my form its telling me I have a value in one of the fields and that the other 2 are required.

Which alert message you got? Try to look into that code to check why the condition gets true.
Also, cover OR boolean expression, like

if (document.getElementById('LAST_NAME').value != "" && 
(document.getElementById('FIRST_NAME').value == "" || document.getElementById('BIRTH_DT').value == ""))